@article{StruthW14,
  title = {Relation Algebra},
  author = {Georg Struth and Tjark Weber},
  year = {2014},
  url = {http://afp.sourceforge.net/entries/Relation_Algebra.shtml},
  researchr = {https://researchr.org/publication/StruthW14},
  cites = {0},
  citedby = {0},
  journal = {Archive of Formal Proofs},
  volume = {2014},
}